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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
What size/series "big bolt" and what size/cylinders engine?
GMCs with 6 cylinder engines stayed 6v (positive ground) through 1956 (standard equipment). 400-500 series trucks had an optional 12v system in 1956. All trucks with V-8 engines in 1956 had a standard 12v electrical system.
All GMCs had standard 12v negative ground from 1956 onwards.
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